Confidence: Medium · Source: FCC ULS · As of 2026-09-14
K9PSU callsign genealogy
Currently held by Sorber, Phillip M
The FCC publishes a previous_call_sign on
every amateur license — a self-link to the licensee's prior callsign.
Following those links produces the chain below.
Previous callsigns
Older callsigns held by K9PSU's current licensee, walking backwards.
- Sorber, Phillip MCOgranted 2017-07-11cancelled 2017-07-29
Successor callsigns
Callsigns held now by people who previously held K9PSU.
No current licensee on record previously held this callsign.
All historical holders
Every license row we've seen with the callsign K9PSU, oldest first.
- CZARNECKI, JOHN F WI2004-01-08 → cancelled 2016-02-09
- Sorber, Phillip M CO2017-07-29 active